Safetracks type D contact clamp is used as a temporary or stationary connection of cables to the rail.It can also be used as a temporary connection between two tracks while rails are being changed.Safetracks unique Temporary Rail Bonds, SafeGrip™ type D, are used also as a Track Circuit Operating Device, T-COD. Network Rail approved.The ingenious design and choice of materials ensure a vibration-proof connection with the very best contact between cable and rail without any need for maintenance. A special spring steel produces a high contact pressure via a contact screw with large contact surface against the rail. The cable, in different sizes and lengths, is pre-crimped to the clamp from the factory.Easily mounted only with a wrench. If you want a connection that only authorized personnel can unscrew, there are models with a special locking bolt and associated key.